O-ring design, improper use will accelerate its damage, loss of sealing performance. The experiment shows that if the design of each part of the sealing device is reasonable, simply increasing the pressure will not cause damage to the O-ring. Under the working conditions of high pressure and high temperature, the main reason of O-ring failure is the permanent deformation of O-ring material and the gap bite caused by the O-ring being squeezed into the seal gap. The O-ring distorts during movement.

The main cause of O-ring permanent deformation

Because the synthetic rubber material used in the O-ring sealing ring is viscoelastic material, the initial setting of compression and rebound plugging capacity will gradually lose permanent deformation and eventually leak after a long time of use. Permanent deformation and elastic loss are the main reasons for O-ring to lose its sealing performance. The following are the main reasons for permanent deformation.

1) The relationship between compression ratio and tensile amount and permanent deformation

2) The relationship between temperature and O-ring tensioning process

3) medium working pressure and permanent deformation

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